Judgemental

Just as I was worrying whether if someone will be judgemental about me, I began to be judgemental about others. There is an old saying “己所不欲勿施于人” – Easy said than done. But are we really being judgemental or in “Blink”‘s term thin slicing the situation or assessing the situation? If we do not assess the situation how can we make that one decision?